{"product_id":"ibm-thinkpad-380-replacement-battery-108v-4400mah-li-ion","title":"IBM ThinkPad 380 10.8V Replacement Battery 02K6417 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM ThinkPad 380 Series — 10.8V Li-ion Replacement Battery (02K6417)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 4400mAh Li-ion battery replaces the original cell in the IBM ThinkPad 380 and its variants — 380CE, 380CS, and 380CSE among others. It matches the OEM voltage rail and connector footprint for the 380 series. Cross-reference your original part against 02K6417, 02K6503, 02K6507, 02K6509, 02K6516, or 02K6517 before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThinkPad 380 series fit:\u003c\/strong\u003e\n    The 380, 380CE, 380CS, and 380CSE all share the same battery bay dimensions, 10.8V nominal voltage rail, and connector pinout — which is why one cell covers the full sub-series without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on ThinkPad 380 hardware. The BMS handshake completed without error flags, and the cell accepted a full charge to 47.52Wh capacity with no thermal events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration after install:\u003c\/strong\u003e\n    After fitting this battery, run the laptop on battery power until it hibernates at low-voltage cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on the 380 series.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eThinkPad 380 shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff, not a fuel gauge error. Under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can track — the laptop sees the voltage fall below the BMS cutoff threshold while the OS still reports 20–30% remaining. It happens most often on a freshly installed cell that has not yet been calibrated. Run one full discharge to hibernate, then a full uninterrupted charge to 100%. After two to three calibration cycles, the gauge IC aligns to the new cell's actual discharge curve and the premature shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting new battery health as poor immediately after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkPad 380 BIOS reads health data from EEPROM registers written by the previous cell. When a new cell arrives, those registers either hold stale degraded-cell data or are blank — both read as poor health in the BIOS summary screen. This is a data state issue, not a fault with the replacement cell. Run the battery learn cycle: discharge fully to hibernate cutoff, charge to 100% without interruption, and repeat once more. After two full cycles the BIOS rewrites the EEPROM health registers against the new cell's actual charge capacity and the poor-health flag clears.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410881970266,"sku":"BWCS-IB380HB-1","price":70.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410882003034,"sku":"BWCS-IB380HB-2","price":83.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410882035802,"sku":"BWCS-IB380HB-3","price":92.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IB380HB-big.webp?v=1779581443","url":"https:\/\/batteryweb.com\/products\/ibm-thinkpad-380-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}